Folding knife



FIG. 1 is a front perspective view of a folding knife as claimed therein;

FIG. 2 is a right side elevational view of the folding knife;

FIG. 3 is a left side elevational view of the folding knife;

FIG. 4 is a top plan view of the folding knife;

FIG. 5 is a bottom plan view of the folding knife;

FIG. 6 is a front elevational view of the folding knife; and,

FIG. 7 is a rear elevational view of the folding knife. 

The ornamental design for the folding knife, as shown and described. 